This regulation amends the exemption from the requirement of a tolerance for residues of Didecyl Dimethyl Ammonium Carbonate and Didecyl Dimethyl Ammonium Bicarbonate, jointly referred to as DDACB on food contact surfaces when applied or used in public eating places, dairy processing equipment, and/or food processing equipment and utensils. Lonza, Inc. submitted a petition to EPA under the Federal Food, Drug, and Cosmetic Act (FFDCA), requesting an amendment which would provide for an increase in the final use concentration of DDACB in products eligible for the exemption from the requirement of a tolerance. As amended, the regulation will exempt solutions from the requirement of tolerance residues resulting from contact with surfaces treated with solutions where the end-use concentration of the DDACB does not exceed 400 parts per million (ppm).